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Infections are caused by tiny organisms, known as bacteria or viruses. There are millions of organisms that surround us.

Viruses are carried in tiny droplets and are passed between people when someone with the virus coughs or sneezes. People who are infected produce antibodies to fight the virus. Once they have fought of this strain, they will be able to fight it if infected again. However, over time, the virus can change into different forms, which means the body may not have the right antibodies to fight it again.

ACUTE BRONCHITIS AND BRONCHIOLITIS

Almost 90% of cases of acute bronchitis are related to viruses such as influenza and the rhinovirus. Less than 10% are linked with bacteria.

Bronchiolitis is most often caused by respiratory syncytial virus (RSV) in infants and babies.

INFLUENZA

There are three influenza viruses A, B and C. A has the biggest impact, B causes less severe illness and C does not cause any illness in humans.

When a new strain develops that people have no resistance to, it can spread across the world. This was the case during the ‘swine flu’ outbreak in 2009.

PNEUMONIA

The most common cause of pneumonia in adults is a bacterium called Streptococcus pneumonia. Viruses can also cause pneumonia, most commonly the respiratory syncytial virus (RSV) in small children, and sometimes influenza. Hospital-acquired pneumonia is caused by germs in a hospital, whereas community-acquired pneumonia is caused by different germs in the community.

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Thanks For Sharing informative information with us.

The most common respiratory tract infection is a cold.  Most lower respiratory tract infections are also caused by viruses. The exception is pneumonia, which is usually caused by  pneumonia bacteria.

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